Core for winding field coils



Nov. 4, 1941. F c, WILSON 2,261,199

CORE FOR WINDING FIELD COILS Filed Dec. '7, 1939 2 Sheets-Sheet l Attorneys Nov.'4, 1941, F. c. WILSON 2,251,199

' CORE FOR WINDING FIELD COILS Filed Dec. 7, 1939 2 Sheets-Sheet 2 Inventor E 6'. Wi 2.3 017 mw x.

' A iiorneys Patented Nov. 4, 1941 UNITED STATES PATENT OFFICE CORE FOR WINDING FIELD COILS Fletcher C. Wilson, Macon, Ga. Application December 7, 1939, Serial No. 308,080 4 Claims. (or. 140-922) This invention relates to a core primarily adapted for the winding of coils for the field of electric motors.

It is aimed to provide a novel core which is adjustable so that the coils wound may be of different shapes of and the desired size according to the particular motor, a construction wherein the core consists of relatively movable parts each substantially half of a cone, and a construction whereby the coils are wound in connected, successive series from the smaller end of the cone, and are removed by movement of the series, accompanied by nesting thereof in the direction of the smaller end of the cone.

The more specific objects and advantages will become apparent from a consideration of the description following taken in connection with accompanying drawings illustrating an operative embodiment.

In said drawings:

Figure l is a view in elevation showing the cone in connection with and adjustably mounted on a winding head;

Figure 2 is a longitudinal section taken between the sections of the cone and looking toward the inner surface of one of them;

Figure 3 is an enlarged sectional view taken through the cone sections and the mounting head;

Figure 4 is an enlarged elevation looking toward the inner surface of the inner end of one of the cone sections;

Figure 5 is a cross section taken on the line 5-5 of Figure 1;

Figure 6 is a cross section taken on the line 6-6 of Figure 2;

Figure 7 is a cross section taken on the line 11 of Figure 2, and

Figure 8 is a detail perspective view of one of the coil engaging clips which may be used.

Referring specifically to the drawings wherein like reference characters designate like or similar parts throughout the different views, the core consists of two parallel sections l0 which are similar in construction and collectively form substantially a cone in that the outer surfaces thereof are at all points arcuate in cross section and tapered as shown. Such sections ID are hollow throughout most of their length, being open at their inner faces and along their longitudinal edges are flattened and provided with measurement marks or calibrations as at I Said .conesections |0 during winding operations are adapted to be rotated through the rotation of a head or element l2 which is connected to the shaft of an electric otherwise rotated. Such bar l3 removably bolted 3 has a central bearing l5 in which a shaft or rod |6 is journaled, being held against longitudinal movement through the engagement of the inner end of a screw I! in an annular groove l8 about such shaft. At opposite ends, said shaft I 6 is screw threaded in opposite directions as at I9 and engaged with fixed nuts 20 on brackets 2| slidably mounted on the bar or plate l3.

The core sections ID at their larger ends are reduced to form attaching shanks 22, whose inner ends are notched or cut away as at 23 so that they will fit around the shaft I6 and provide ample clearance for rotation of the latter. In addition, removable bolts 24 detachably secure the core sections I0 to the brackets, the same passing through the shanks 22, as shown. Knurled knobs or the like 25 are provided at opposite ends of the shaft l6, either of which may be operated to rotate the shaft l6 and according to the direction of rotation, move the core sections I0 closer together or wider apart.

In winding coils for motor fields, the metallic wire 26 is supplied from the smaller end of the cone or sections and wound about the same toward the larger end of the core and first in a series of contacting coils 21 forming a layer. The wire is then spread by one or more separated coils 28 and then wound into a layer of contacting coils at a group 29, then the wire is spread again at one or more coils 30 and finally wound into a group or layer of contacting coils 3|. Rotation of the core is then stopped and suitable clips 32, as detailed in Figure 8, are applied about the groups 21, 29 and 3| to prevent the groups of coils from springing out, twisting and tangling. The clips 32 are accommodated in the grooved edges of the sections wherein calibrations H are provided, when such sections are in close proximity. Such clips may consist of bars 33 of metal, having elastic rubber loops 34 fastened to one end thereof and adapted to engage the groups on opposite sides to the bars, and

motor, for example, or head l2 has a plate or thereto as at M. Plate thereafter engage the reduced ends 35 of such bars as shown in Figure 1.

Following the winding operation mentioned, the wound structure is removed from the core sections as follows. First, the group 3| is pulled toward the smaller and of the cone sections and over the group 29, thereby becoming nested. in and concentric with the group 3|, and thereafter, the nested groups 29 and 3| are further pulled toward the smaller ends of the core sections and incidental to which the group 29 is moved over the group 21 the latter being nested within the group 29 and concentric therewith and with the group 3|, and thereafter all of the groups as a nested unit are removed from the core Sections so that such groups may be wound into the usual motor slots to form the field coils of the motor, the winding in the slots starting at the smaller end of the group 21 and being Wound in the motor slots one coil at a time, it being understood that the clips 32 are removed one at a time as winding proceeds.

It will be understood that the core sections It] may be made in any desired size and dimensions according to the motor or work wherein the wind ings are to be used, and that the measurements or calibrations ll may vary, as preferred, and that they serve as gages in winding, in order to provide the groups of the desired diameter, numbers of coils according to the motor, and the distances apart at which the winding groups should start and end. The method disclosed herein is covered in my application Serial No. 340,407, filed June 13, 1940, forming a continuation in part of this application.

Various changes may be resorted to provided they fall within the spirit and scope of the invention.

I claim as my invention:

1. A core for the winding of coils for motor fields consisting of sections adapted for movement relatively, angular brackets, an element adapted for rotation on which the brackets are slidable, a non-slidable rod journaled on said element and passing through angles of said brackets having oppositely directed screw portions, fixed nuts on said brackets engaging said screw portions, and means securing said sections to said angles.

2. A core for the winding of coils for motor fields consisting of sections adapted for movement relatively, angular brackets, an element adapted for rotation on which the brackets are slidable having a bearing, a rod journaled on said bearing and passing through angles of said bracket having oppositely directed screw portions, fixed nuts on said brackets engaging said screw portions, bolts securing said sections to said angles, the adjacent ends of said sections being cutaway to accommodate said rod.

3. A core for the winding of coils for motor fields consisting of sections, means to move said sections toward and away from a position relatively close to each other, said sections being cutaway along adjacent edges thereof to accommodate clip means engaged with coils on the core,

4. A core according to claim 2 wherein adjacent edges of the sections are cutaway to accommodate clip means engaged with coils on the core.

FLETCHER C. WILSON. 

